The problem is the lousy quality control at Hatsan. Pitiful!Not the fault of the precisions products of DonnyFl. I returned the Nova as it was barley better than 3rd world junk. Terrible Having worked hardened metals in fine detail for over 40 years, I have an Eye for quality. Hatsan simply doesn't have it. Sadly.
Look at this video about midway to see a discussion of point of impact movement.